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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d87b456fc7925b2cc577d827a016d77711cca78f9648df445da711610f2f953' 
  AND token = '6VC7++YVufEj5/2kYlOczCdQw86Vie9IsBJ7ZfDrHsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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