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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4760736c16056d1bdea37251048f85878e5e65867ee9b81a4314f37e03abef' 
  AND token = 'yKHJ34alLaAEn7MmCJuZ8WAdU2uj+CB/gu95J9nLrWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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