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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19ac09a5db9eb0a31b05636641f0b6b0d7e0119fde37e23fad007688758c779' 
  AND token = 'fmqKdFOlVMG9a2akbWgRN9VPXg6xkl1v/hU4DuSVg34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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