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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabe8daf11e4d49eddc015b7e69915864e5e415fd0f7adff780c395c4ab84e9e' 
  AND token = 'SB2kEpMi2zUPc419OFSaWUQ4uJ5Y92mLg5+lU7/mzZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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