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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d57b2f341f3def6c318f770697ad65f91b4c59826b555342dad2ccb0b875a22' 
  AND token = 'atuRKm2at/ha28SGNmPT9t4HgLoEsHl6gMK/V0F6w4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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