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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7594540ae83bee4bb0ba59367fa1579e75effab4fbae8010ff32ccd4f4cbc21' 
  AND token = 'xeBBUZAPkUB2bvQrQczIa09sJ8yX3739cw30QHSdIRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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