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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dec3a5a83b625530bcce1e463d209df7f81761cc9c367a525954c18e3db7cda' 
  AND token = 'Mp76JXoInGRqi8If3PcDW2IseVp8Egdrp+yf7nGseak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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