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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afdab4a7aaf553bb16b35d0f70b63ef60f470ca1b0a8b43c5290855deb158d7' 
  AND token = 'nbEBBb/5nwJ1116RRYUowWdfchLREP0c3G99FTHjBDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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