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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab245d1f0b067de5c49b8ea8eb44dce30deae78fae85e56cd13a349c92c8f870' 
  AND token = '1/wGGykrX7EtWwgrqj/ZTGHkPKS18Zv8wpdh0nm9PNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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