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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1a34bd1f4f011aaaab89e8c729b2e961e245805922a6b3157dac8f3fb66ea9' 
  AND token = 'xkvzajV+rjwGc1QYLtSCb9i2S3/erCX7WVqGBYvOE9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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