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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4eaaa2178961cd586aca1882a4a7c0fecf22027ff04be35ef69df2b00f32c6' 
  AND token = 'el4y/l7RxInqCAaxFNbRAUvWQJ4CC/OvuVpsNZtf5QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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