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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3607dc3e838a2ddf90ea79887f7b0243a3effea4790f6cf2497b2a74fa098b' 
  AND token = 'kIz0a7FxFM5uzPiWYGDxRo+gD1KJeOVm1Yoh+aJgII8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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