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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86883a517ebcfb982ed0ccfb7afba87ced66d02fa994001dadafb8092dc8fe71' 
  AND token = '2LWvM380s6mId3+tQCflowFmu1fblSgGNqjg9ectzSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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