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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff987a7ee4681d18ceadd45bdae971fc816198517f47e734fc8d4b7654c3fdc4' 
  AND token = 'Ccw52SMpDZ5VVO3INtUMyKMn6b0+LfUFb67t1tul634=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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