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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4029c7f3931171122b6625d502e25672b1a5e562dfd3bce6c5e381c3a6d2dd06' 
  AND token = '0me8FORK3+GGiOTB4QovxBXwWRIIk+KirFJtneyBbig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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