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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e5f11429adccd80c87bb0f9b2f18551a8ab57cae8d0c0c1711b9925b9cb003' 
  AND token = '7UeHLiIckxC5k52pMAzVlIAyneig03bnyqO7GwC69fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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