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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62a918db192d8b8050cf147a16ce44f98b6fa09863a53e38582cb83d1e1f786' 
  AND token = 'nejE6FGo3ZjY41tD3KThfQXi3g8vnphlx0C/INTHDFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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