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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30bd86e628b688ca00483ee94bce19f9fd9bb2e3f92a85dd20157d838b49518' 
  AND token = 'pZ3AVcR9g/X6Y8U3fpSJdFq7RnqHMKg4ybC4hlcxcS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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