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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d0247a58496a3058c901e476c6ea922be9fcad3709ffbe6a62b651057bc701' 
  AND token = 'njlBe4270CQFuC5ej6X0Zzdg0nvGyCoDMCH5N5Ll7ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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