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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b532cf1b781f536843ff601e1b9400743385c2f9ae2b84e15573050d97fc8985' 
  AND token = '5ee0Fw+zvoUg3wdV3OYmKlNXVyzuWJeR6634AcLcO/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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