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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1be2ece00868f47f3683fb9a51904b22adbd9e44d9320e001b3103ad203667' 
  AND token = 'DTywa4KmAIowU6U5GFhdSecBlIKIE4ujRxPaCglmF9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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