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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95a11400aad73e54a3fda4af68673060c5ded5157e8a9574e928b0d185e5b61' 
  AND token = 'lR9ggKUqVKE8gE2cnDwqGGPSFi4SnNiL4tGJqPLpr8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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