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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc89a4d617378e1e465091f61942f92d0032417b82ca6bd14ed416b1faeee812' 
  AND token = 'UHdIe2EmouFNtpzTmmUNCF/xWjRdeTajBZ6dOeELhh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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