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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1ef8bf2f95e8012e23e23eebda9b865b782fc73e565eceb532e67dbb5c21b6' 
  AND token = 'RlXEjB4gBDIKaVBMf4vnaUp2bFL/Doadr8SJmmy7Plk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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