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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d4eab3b3532e3c080380f9afc0c919e5bf63318c1ef963d984d432d79714b7' 
  AND token = 'cL68kQpoWWBHKfOje2b9qthRd1d0l6tw443Cr+qvdog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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