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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cd9257f22aa0b47c38241e8e463437c0d42298e1c2abb73fae22cdea4fa76d' 
  AND token = 'rnOW0zX8NjA0TK6Frjqrnor3i1uBdDlOcQQKT3SRzqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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