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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a795ae23d9eb74744bd6710f81ba85cd9f360360c0223369c9ff4a5f01a2c39c' 
  AND token = '91+sXfVEZ7o1XVXm02S9wGI5OVkv7kff4FgzXsaYTrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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