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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e013d13fa7273cd72eb5a3969c11524d5ccda60ca079e7484190e7895257c86c' 
  AND token = 'nC3PupVhq55HQ4/s+LeZSXSQWLOws2gYPBatSZcCMLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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