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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff377f9e1c4339d374dab234e930c3546f6d774bf67ec5769a02c8ba920972ae' 
  AND token = 'FAvb4rt7ghirFrphsa3zvJ4OfuXKDiRrdrJe7vBITmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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