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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3cdd7013e3f6959aa55746afab9a3464092db5029327e39553798ef898cc2f' 
  AND token = 'v8AW9JERpP2mbUthUUJ1/1coLabcyF4y3h9EaU6s8Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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