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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f136562daba27b926da1569767f70f3ef22cb432643fdfeb885de113f6741a2' 
  AND token = '3pdmR4kyVdyV4PC6HiybLmEX8NW5NSyytOTQ7+UQr00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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