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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc6826919b4d5cf1481389a33872e664c8925b303b40aec22800edd062408b2' 
  AND token = 'UwYx11Q6z5oJ/qqirhCwdLG9jwM+x4McDvmATa3ep1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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