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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223f0adcc2cf29eeba3452c237e8038fc232c0d78832cda68f5e6cd988c73c7b' 
  AND token = 'O77SgpD9viI5s2WlRABFoGUPKRaqqeWw8WYKZDTG+vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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