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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213b6274f107b932ac6473f8b0ea36e85d110628cd56931fcf4d632af454d7a3' 
  AND token = 'LIUkqy/cQ/vU+vp1fe05KRd526+Td6VE3HZxBh/4L1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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