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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa6175adf70f14e63119d1fc9ce90d1e2138916da86562aa2ea4faae282903c' 
  AND token = 'RhQIAzP4Pe8APR4BREFwCmqEr8v+aLMGjBjOg6mkwWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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