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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209f15a88eaf4dda637eeb2a216ce2b6baacc572aebb4174ad7cc4f83bf018a2' 
  AND token = '8ZKmO7e7xYLAwqC2U6k9DQkD643adPvOzm+6hobp3hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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