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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910ac418396acf8e0cf187b03bf7d038430100baf03334d3f72b49c19f07dc33' 
  AND token = '9zsaT9zKHQATqHlq6nVnI6DoVkeiNwuDbnM1usfz++4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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