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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7a990e7ebe91b6fef5dae7516f8c4ac0ace305e1b9a67694e9757b91c557c2' 
  AND token = '13gf165WSPfY6fswtL9PjO33TGyTagFULy0yYCnoGmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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