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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38cef57216225a164f20710d2a4f7640cb7cccb117a05874342652f356254cb' 
  AND token = '+9h384ScJefZt2WatHawr9k0DYuzyOVpEwC9rGEhytI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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