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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaca74a302477e68154a57e7b01ef3b3f9ca4c7938d42b396fd3af931adb8b2e' 
  AND token = '8G3s42qYNxK3vFF/7bKNCWV8zk8FvUzWyAagcGpRvYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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