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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b843049a2fd463a7d68420c291cea28884f028d0dd903044bb4d60512dad24' 
  AND token = '2vNn94H/jz09iPuMC1xJKaslM+cyLZplnztV+t/Zoyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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