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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512053f553fddfb40c9e75474a286ebfd97dc547518b05b38303e427977bc950' 
  AND token = '+8kSX/KWH+IylUvf82+kZr+OHhueouFqgN5BDn7P8hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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