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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e59eb3c59a16d1d525dc424b49090ab185c1120a302b75f064f3324e13e27c8' 
  AND token = 'plSrF0r6WW95pQF2npeQaveR9+u1Gf7lqmc9zGQLduc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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