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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51946c6bc75b62951c6c180a98a1f18f25420c542784f9438a141a117d84dfa2' 
  AND token = 'xEOdOv8MGp5bqoZ6ptE4oioONr2k/oDc6I8HYY5vMm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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