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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1770c6be30af8ec4246507e90ecbdebf2489578a94da9104aa1f87a50e4326' 
  AND token = 'q2g5DasGjCy6fMTSBvmeg+2QGAzuRDerA5wCjgbKszc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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