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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624c618dfbcdb5354704ef3e4d67d21ee91830095477dddd9855965dc0dfcf90' 
  AND token = 'TU5QkE5CBuxfcUY6TNzVWxnZxr07mLTbcTvARb0Ppuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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