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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce24e7b54ceef74b9d36e6513cd8ca82775f4370e7a9061a4171e6b84617e75' 
  AND token = 'RPiClFWTqiOTMezDQCrqYMg03ncgyNVyv8HNbkgb69Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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