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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c44b2e1054912b05d3766f8efbfeccef01db0d2b95bb8a280f78cc483cfd9b' 
  AND token = 'yAiaMoy7cJVXSe4s18tslm8/wYT+0R3JAtwtCiFPIVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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