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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d80779129d87a68e3f160072e07fcbae5d57f3aacd53e8c700ec7da0bc9712' 
  AND token = '1OJNix9AUEP6S+J65GKl6bDkg8JSozr3d75hW3uDqeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}