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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db93a30a9519fec61f9920b2ecfc1eafc7a57a070c52c8eed8ce75da2379622e' 
  AND token = 'cCUKzpEV/eYUefW5JOK2JKbcGFVpA6mqRO8Pw9YY5u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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