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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9beb4ffa9797a808aa301b4d08ebb30512bbff4664d22ab938f663962de3f3b' 
  AND token = 'B9JueXve7LJu1tuU+DgQd6S3Vgg/GtSVsF4X9+9GMSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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