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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d234ad4fb065318fc1ab7992eb2f1b72132c0bbae617e5a057d9dc4207ef5f' 
  AND token = 'u9RKCze273NohAd8INP0YW1Z6dDQ8UDA/V8SnObxbe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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