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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659076f35193e57621008c8d0cf1147b0b3cd51cd0153f5d8c0c72ae40387638' 
  AND token = 'hK/JP7TZct1RAGZPrSqvl6Sr0feQuDE5nFfA5Mdj7XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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